A UHF RFID Tag Embeddable in Small Metal Cavities

A compact in-metal ultrahigh frequency radio frequency identification tag for identification of metal components is described. The radiating element is printed on a 23\times 23 \times 1 mm 3 copper-clad alumina (Al 2 O 3 ) substrate ( \varepsilon _{\mathbf {r}} = 9 , tan \delta = 0.0003 ) and cons...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2019-02, Vol.67 (2), p.1374-1379
Main Authors: Michel, Andrea, Franchina, Vittorio, Nepa, Paolo, Salvatore, Alfredo
Format: Article
Language:English
Subjects:
Aluminum oxide
Cavity resonators
Epoxy resins
Holes
Impedance
In-metal tag
metal embedded tag
Metals
Patch antennas
quarter-mode patch
Radio frequency identification
radio frequency identification (RFID)
Radiofrequency identification
Robustness (mathematics)
Substrates
tag antenna
UHF antennas
Ultrahigh frequencies
ultrahigh frequency (UHF)
Very high frequencies
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Description
Summary:A compact in-metal ultrahigh frequency radio frequency identification tag for identification of metal components is described. The radiating element is printed on a 23\times 23 \times 1 mm 3 copper-clad alumina (Al 2 O 3 ) substrate ( \varepsilon _{\mathbf {r}} = 9 , tan \delta = 0.0003 ) and consists of two rectangular quarter-mode patch antennas properly arranged to make the tag performance as robust as possible even when the tag is embedded in small cavities carved out of metal objects. The entire structure has been optimized by taking into account the presence of a thin superstrate of commercial epoxy resin used to protect the tag. The effect of the cavity size on the tag performance is numerically analyzed. Measurements on a tag prototype are also described and discussed.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2018.2883570